Try the zip ties higher up. Closers to the top gear. this is what worked for me on a 16 axys putting on pro gears with new belt. took about 5 minutes of wiggling it around and then it just slipped on. You may have to turn the lower or upper shaft to get it lined up better. That's what I did to get it to eventually go on. When it did, it just slipped on easily. I was actually shocked once it went on that smoothly.